// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/events/gesture_event_details.h"

namespace ui {

GestureEventDetails::GestureEventDetails()
    : type_(ET_UNKNOWN)
    , touch_points_(0)
{
}

GestureEventDetails::GestureEventDetails(ui::EventType type)
    : type_(type)
    , touch_points_(1)
{
    DCHECK_GE(type, ET_GESTURE_TYPE_START);
    DCHECK_LE(type, ET_GESTURE_TYPE_END);
}

GestureEventDetails::GestureEventDetails(ui::EventType type,
    float delta_x,
    float delta_y)
    : type_(type)
    , touch_points_(1)
{
    DCHECK_GE(type, ET_GESTURE_TYPE_START);
    DCHECK_LE(type, ET_GESTURE_TYPE_END);
    switch (type_) {
    case ui::ET_GESTURE_SCROLL_BEGIN:
        data_.scroll_begin.x_hint = delta_x;
        data_.scroll_begin.y_hint = delta_y;
        break;

    case ui::ET_GESTURE_SCROLL_UPDATE:
        data_.scroll_update.x = delta_x;
        data_.scroll_update.y = delta_y;
        break;

    case ui::ET_SCROLL_FLING_START:
        data_.fling_velocity.x = delta_x;
        data_.fling_velocity.y = delta_y;
        break;

    case ui::ET_GESTURE_TWO_FINGER_TAP:
        data_.first_finger_enclosing_rectangle.width = delta_x;
        data_.first_finger_enclosing_rectangle.height = delta_y;
        break;

    case ui::ET_GESTURE_SWIPE:
        data_.swipe.left = delta_x < 0;
        data_.swipe.right = delta_x > 0;
        data_.swipe.up = delta_y < 0;
        data_.swipe.down = delta_y > 0;
        break;

    default:
        NOTREACHED() << "Invalid event type for constructor: " << type;
    }
}

GestureEventDetails::GestureEventDetails(ui::EventType type,
    const GestureEventDetails& other)
    : type_(type)
    , data_(other.data_)
    , touch_points_(other.touch_points_)
    , bounding_box_(other.bounding_box_)
{
    DCHECK_GE(type, ET_GESTURE_TYPE_START);
    DCHECK_LE(type, ET_GESTURE_TYPE_END);
    switch (type) {
    case ui::ET_GESTURE_SCROLL_BEGIN:
        // Synthetic creation of SCROLL_BEGIN from PINCH_BEGIN is explicitly
        // allowed as an exception.
        if (other.type() == ui::ET_GESTURE_PINCH_BEGIN)
            break;
    case ui::ET_GESTURE_SCROLL_UPDATE:
    case ui::ET_SCROLL_FLING_START:
    case ui::ET_GESTURE_SWIPE:
    case ui::ET_GESTURE_PINCH_UPDATE:
        DCHECK_EQ(type, other.type()) << " - Invalid gesture conversion from "
                                      << other.type() << " to " << type;
        break;
    default:
        break;
    }
}

GestureEventDetails::Details::Details()
{
    memset(this, 0, sizeof(Details));
}

} // namespace ui
